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What happens to water vapour when saturated air is cooled further?

Answer and explanation

Correct answer: Extra water vapour begins to condense.

Direct answer: A is correct. Saturated air contains as much water vapour as it can hold at a particular temperature and pressure. Cooling lowers the amount of vapour that the air can hold. Therefore, if saturated air is cooled further, some of its vapour must leave the gaseous state. It forms tiny liquid droplets, such as dew or cloud droplets, or ice particles if conditions are cold enough. B is wrong because the capacity of air is limited and decreases when temperature falls. C is wrong because cooling changes the physical state of water; it does not chemically turn water into oxygen. D is wrong because condensation does not eliminate atmospheric pressure. The sequence is important: cooling leads toward saturation; once saturation is reached, further cooling causes condensation. Memory cue: saturated plus further cooling equals excess vapour becoming droplets or ice.

Related tags

Saturated AirCoolingCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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